Not legal 3 classes
Only reprogramming of the original ECU is allowed.
- Fixed Steering Ski Stock · FSSK.5.2
- Ski Stock · SSK.5.2
- Four Stroke Ski Lites · FSKL.5.2
IJSBA · Ignition
Aftermarket standalone ECU, IJSBA
Distinct from a reflash. Most stock classes allow the reflash and forbid the box.
This page is IJSBA only, and the bodies do not agree. The same part under IHRA and UIM. Which one applies to you is decided by whoever sanctions the race you enter.
The 'no additional inputs or outputs, original connections' clause is what disqualifies most standalone ECUs even in Limited and Superstock. Check pinout, not just brand.
Where it stands, class by class
14 classes, grouped where the same rule gives the same answer rather than listed one by one, because an answer that holds for a class usually holds for every class that borrows its rules.
What each answer below means
- Not legal
- This comes off. The rules refuse it in this class.
- The rules do not say
- Unanswered. The rules do not settle this, so ask the club before you rely on it.
- Legal, with conditions
- Keep it, but measure it: the rules permit this part only inside stated limits.
- Legal
- Keep it. The rules permit this part in this class.
Not legal 2 classes
Four-stroke: reprogramming only.
- Runabout Naturally Aspirated · RNA
- Runabout Stock · RAS.7.2
Not legal 1 class
Aftermarket ECU is not listed as permitted. · RRL.5.2
The rules do not say 1 class
No electrical section exists.
- Ski Modified · SKM
The rules do not say 1 class
No ECU section found.
- Ski Superstock · SKSS
Legal, with conditions 2 classes
ECU may be modified OR aftermarket, provided it offers no additional inputs or outputs and uses original connections.
- Runabout Limited · RAL.7.2
- Runabout Superstock · RSS.8.2
Legal 3 classes
The ignition system and electrical box may be modified or aftermarket with no limit on inputs or outputs, read here as covering the ECU, which the class document does not name.
- Freestyle · FREST.5.1
- Ski Grand Prix · SKGP.5.1
- Sport GP · SPGP.8.1
Legal 1 class
ROP.7.1: "Ignition system, electrical box, flywheel and flywheel cover may be modified or aftermarket", with no limit on inputs or outputs. On these four-stroke craft (ROP.4) the ECU runs the ignition and sits in the electrical box, and the class also allows added injectors (ROP.5.1), removing the airflow sensor (ROP.5.2) and adding a turbo or supercharger (ROP.8.1), none of which works without a changed ECU. A reading of ROP.7.1: the class document does not name the ECU, where Limited and Superstock do (RAL.7.2, RSS.8.2). · ROP.7.1
Aftermarket standalone ECU: if the rule your class applies reads differently to you, or the rulebook has changed since this was read, ask. We answer with the section we read it from, or that we have not read it. Ask a rules question.
Every IJSBA class · where the rulebooks differ · checks on parts the shop sells · how this site reads a rulebook.
Ignition · four stroke · legal in 6 of 14 answered, 2 with conditions